Flexural properties and impact strength of denture base resins reinforced with micronized glass flakes

Choksi, Ronak H; Mody, Pranav

doi:10.4103/0972-4052.176532

Cited by 20 publications

(13 citation statements)

References 13 publications

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“…The means and standard deviations of the flexural and impact strength [22][23][24][25][26][27][28][29][30] of the control, fiber only and different concentration of copolymer groups are given in Tables 3 and 4. Table 3.…”

Section: Mechanical Testmentioning

confidence: 99%

Influence of Concentrations of Methacrylate and Acrylate Monomers on the Properties of Fiber Reinforced Polymethyl Methacrylate Denture Base Materials

2018

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The study aimed to evaluate the effects of adding different concentrations of 2 hydroxyethyl methacrylate (HEMA), 2-hydroxyethyl acrylate (HEA), ethyl methacrylate (EA) and isobutyl methacrylate (IBMA) monomers on the structural, thermal and mechanical properties of a fiber reinforced heat-polymerized acrylic resin. For each test, 126 acrylic resin specimens were fabricated and divided into 6 groups with 7 specimens each. One group was the control group, the other one is a fiber reinforced group and others were the test groups, which were formed according to the different concentrations of monomers. 6 mm length, and the weight ratio of 3% short glass fibers are added to acrylic powder polymerized by heating. The 2%, 5%, 10%, at 20 % ratios of different comonomers added to a monomer of MMA are composed of copolymer structures. Flexural strength was assessed with a three-point bending test using a universal testing machine. Impact strength testing was conducted using an impact test machine by the Charpy method. The analysis of the connection between acrylic resin and fiber by SEM and structural changes in the acrylic resin was investigated by FTIR spectroscopy. Data analyses using analysis of Kruskal-Wallis and Mann-Whitney U tests (α=0.05) significant difference tests showed that adding 2%, 5% HEMA and IBMA monomers significantly increased the flexural and impact strength compared to the control, only fiber and others group (P< 0.05). It is observed that the process of adding low concentration of HEMA and IBMA monomers improved certain mechanical properties of fiber reinforced with polymethylmethacrylate.

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Section: Mechanical Testmentioning

confidence: 99%

Influence of Concentrations of Methacrylate and Acrylate Monomers on the Properties of Fiber Reinforced Polymethyl Methacrylate Denture Base Materials

2018

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“…The notch depth was 0.8 mm across the entire 6 mm width of the specimen, leaving an effective depth of 3.2 mm below the notch. The force was applied to the notched surface (40) .…”

Section: Specimens Preparationmentioning

confidence: 99%

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Al-Mahdy

Eltayeb

2018

ADJ-for Girls

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Purpose: This study was conducted to evaluate the effect of rein forcement of different concentrations of nano-ZrO 2 and nano-Al 2 O 3 on the flexural strength and impact strength of repaired acrylic resin denture bases. Materials and Methods: A total of 100 specimens were prepared from heat-polymerized acrylic resin and then they were equally divided for the flexural and impact strength tests. 50 specimens were assigned for each testing group. For the flexural strength testing, metallic rectangular molds with rectangular-shaped (65 mm length x10 mm width x 2.5 mm thickness) were prepared. While specimens for the impact strength testing were prepared using rectangular-shaped molds with dimensions of (50 mm length x6mm width x4mm thickness). The prepared intact specimens were cut vertically in two halves along their long axis. For the flexural and impact strength testing, a repair gap was done. Specimens for each strength test were divided into one control group (specimen repaired with autopolymerizing acrylic resin with no fillers) and two repair groups with 2 concentrations (2% and 5%) of nano-ZrO 2 fillers and two repair groups with 2 concentrations (2% and 5%) of nano-Al 2 O 3 fillers. Flexural strength was measured using an Instron mechanical testing machine and impact strength was measured by Izod impact tester. Results: For the flexural strength results, the highest flexural strength was recorded with the 5% nano-ZrO 2 fillers repair group followed by the 2% nanoZrO 2 group which also recorded higher significant mean value than the control group. In both nano-Al 2 O 3 groups, there was a highly significant reduction in the flexural strength for both concentrations. For the impact strength results, the highest impact strength was recorded for the 2% nanoZrO 2 fillers repair group followed by the 5% nano-ZrO 2 group which also recorded higher significant mean values than the control group. In the 2% nano-Al 2 O 3 repair group, there was a non-significant difference in the impact strength mean values compared with the control group. While the repair group reinforced with 5% nano-Al 2 O 3 showed significant reduction in impact strength. Conclusions:The incorpora tion of nano-ZrO 2 into repair resins may improve the flexural and impact strength of the repaired denture base whereas nano-Al 2 O 3 caused reduction of both strengths.

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“…Since then it became the most reliable material for denture construction. [1][2][3] Despite its favorable properties such as satisfying esthetics, ease of processing, and acceptable cost, it is not considered an ideal material due to its inferior properties such as surface hardness and low impact strength. 4,5 Impact failures that happen as a result of accidental dropping of the denture lead to crack propagation which affects its clinical performance.…”

Section: Introductionmentioning

confidence: 99%

“…4,5 Impact failures that happen as a result of accidental dropping of the denture lead to crack propagation which affects its clinical performance. [1][2][3][4][5][6][7][8][9][10][11][12][13] Another crucial property is surface hardness which relates to the material wear that can take place during daily denture brushing causing roughness and facilitating microbial adhesion. 6,7 Several techniques have been investigated to improve the properties of PMMA by incorporating suitable fillers such as fibers, metal oxides, or rubber like substances in its composition.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Impact Strength and Surface Hardness of Acrylic Resin Modified with Different Nano Materials: An In Vitro Study

Maheshwari¹,

Abrol²,

Singhal³

et al. 2019

International Journal of Prosthodontics and Restorative Dentistry

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Aim:The fracture of the denture resulting from the accidental fall on the ground is affected by the impact strength of the acrylic resin. Many attempts have been made to improve the mechanical properties of acrylic resin by reinforcing it with different materials. The aim of this study was to evaluate the effect of addition of different nano materials on the impact strength and surface hardness of the acrylic resin. Materials and methods: Fifty samples of dimensions 65 mm × 10 mm × 3 mm were made and divided into five groups. Group I is the control group of heat-activated polymethyl methacrylate (PMMA) acrylic resin, while groups II, III, IV, and V are having 1% and 3% zirconium oxide (ZrO 2 ) and silicon dioxide (SiO 2 ) nanoparticles in heat-activated PMMA by weight, respectively. A metallic block was fabricated and invested into addition silicone impression material to form a mold. The modeling wax was melted and flown into the mold cavity to form the wax block. The samples were subsequently polymerized, retrieved, finished, and polished. Impact strength and surface hardness were measured by Izod impact testing machine and Vickers hardness tester, respectively. Results: The results showed that the control group had the highest impact strength and lowest value was observed with 1% SiO 2 . The value of Vickers hardness was maximum with 1% ZrO 2 and least with the control group. The analysis of variance (ANOVA) for both the impact strength and surface hardness indicated a p value of <0.001, which is very highly significant. Conclusion: Incorporation of ZrO 2 and SiO 2 nanoparticles into the heat-activated PMMA affects the impact strength and surface hardness.

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Flexural properties and impact strength of denture base resins reinforced with micronized glass flakes

Cited by 20 publications

References 13 publications

Influence of Concentrations of Methacrylate and Acrylate Monomers on the Properties of Fiber Reinforced Polymethyl Methacrylate Denture Base Materials

Influence of Concentrations of Methacrylate and Acrylate Monomers on the Properties of Fiber Reinforced Polymethyl Methacrylate Denture Base Materials

The Effect of Nano- ZrO2 and nano-Al2O3 Reinforcement on Flexural and Impact Strength of Repaired Acrylic Denture Base

Evaluation of Impact Strength and Surface Hardness of Acrylic Resin Modified with Different Nano Materials: An In Vitro Study

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